Authentication details provided was rejected by Source server. Kindly provide valid username and password.

Authentication details provided was rejected by Source server. Kindly provide valid username and password.

I have a Zoho Mail.

I started to use Zoho CRM because of email marketing.

When I go to email configuration and try to link my Zoho Mail the following message appears: "Authentication details provided was rejected by Source server. Kindly provide valid username and password."

What can I do?

I want to link my Zoho Mail...